scholarly journals Rapid Growth Inhibition of Avena Coleoptile Segments by Abscisic Acid

1973 ◽  
Vol 51 (1) ◽  
pp. 93-96 ◽  
Author(s):  
Marilyn M. Rehm ◽  
Morris G. Cline
Keyword(s):  
Abscisic Acid ◽  
Growth Inhibition ◽  
Rapid Growth ◽  
Avena Coleoptile

Studies on the action of abscisic acid on IAA-induced rapid growth of Avena coleoptile segments

Planta ◽  
1973 ◽  
Vol 114 (1) ◽  
pp. 87-93 ◽  
Author(s):  
J. J. Philipson ◽  
J. R. Hillman ◽  
M. B. Wilkins
Keyword(s):  
Abscisic Acid ◽  
Rapid Growth ◽  
Avena Coleoptile

The nature of growth inhibition by calcium in the Avena coleoptile

Planta ◽  
1957 ◽  
Vol 48 (6) ◽  
pp. 696-723 ◽  
Author(s):  
Bruce J. Cooil ◽  
James Bonner
Keyword(s):  
Growth Inhibition ◽  
Avena Coleoptile

The effects of abscisic acid, kinetin, and gibberellin on freezing tolerance in smooth bromegrass (Bromus inermis) cell suspensions

1989 ◽  
Vol 67 (12) ◽  
pp. 3640-3646 ◽  
Author(s):  
Martin J. T. Reaney ◽  
Lawrence V. Gusta ◽  
Suzanne R. Abrams ◽  
Albert J. Robertson
Keyword(s):  
Abscisic Acid ◽  
Gibberellic Acid ◽  
Growth Inhibition ◽  
Water Content ◽  
Freezing Tolerance ◽  
Cold Hardiness ◽  
Lethal Effect ◽  
Bromus Inermis ◽  
Cell Water ◽  
Smooth Bromegrass

The effects of kinetin and gibberellic acids (GA3, GA4, GA7, GA9, and a mixture of GA4,7,9) on cold hardening, dehardening, and growth of smooth bromegrass (Bromus inermis Leyss. cv. Manchar) suspension cultures treated with abscisic acid (ABA) were determined. Bromegrass cells treated with 75 μM racemic ABA for 7 days at 25 °C tolerated −37 °C, whereas cells treated with both racemic ABA (75 μM) and a mixture of GA4, GA7, and GA9 (total gibberellic acid concentration 100 μM) were similar in hardiness to the controls (LT50, −10 °C). GA4,7,9 at concentrations greater than 10 μM inhibited the growth of cells. Although 400 μM GA4,7,9 was lethal to cells, 75 μM ABA overcame the lethal effect but did not overcome growth inhibition. The twofold reduction in cell water content due to 75 μM ABA treatment for 7 days was partially overcome by GA4,7,9 at concentrations greater than 400 μM. GA4, GA7, and GA9 were equally effective at limiting growth and inhibiting freezing tolerance induced by ABA, whereas GA3 had little effect on cold hardiness, growth, and water content. During the first 4 days, kinetin at concentrations greater than 100 μM inhibited growth of both control cells and cells treated with ABA. Kinetin (> 100 μM) also inhibited freezing tolerance induced by abscisic acid after 4 days, but had no effect after 8 days. Bromegrass cells treated with 75 μM ABA for 7 days were hardened to −37 °C but dehardened to −12 °C after transfer to fresh medium minus ABA after 12 days at 10 °C. GA4,7,9 (40 μM) had no effect on the rate of dehardening, whereas kinetin increased the rate of dehardening.

Changes in the Concentrations of Abscisic Acid in Fruits of Normal and Nr, rin and nor Mutant Tomatoes During Growth, Maturation and Senescence

1976 ◽  
Vol 3 (6) ◽  
pp. 809 ◽  
Author(s):  
WB Mcglasson ◽  
I Adato
Keyword(s):  
Abscisic Acid ◽  
Rapid Growth ◽  
Ethylene Production ◽  
Maximum Level ◽  
Ethylene Evolution ◽  
Tissue Accumulation

The concentrations of free and base-hydrolysable (bound) abscisic acid (ABA) were measured in fruits of cv. Rutgers (normal) and of the mutants Nr, rin and nor during growth, maturation and senescence. Measurements were made also of postharvest changes in free ABA in immature Rutgers fruits. Free ABA began to accumulate rapidly in the pericarp of developing fruits of Rutgers, Nr and rin during the period of most rapid growth but accumulation in nor was delayed and slower. Peak concentrations in Rutgers, Nr and rin were similar but the maximum level in nor was about 50% lower. Peak concentrations of free ABA coincided with the completion of growth in Rutgers and rin but peak levels in Nr and nor were not reached until several days later. Colouring in all strains occurred at approximately the same time as the accumulation of peak concentrations of free ABA. Changes in bound ABA paralleled those in free ABA in pericarp tissue of all strains but the levels were about one-seventh of those of free ABA. Free and bound ABA were measured in seeds and associated mucilaginous tissue only in 50% developed and fully grown fruits. In the younger fruits of Rutgers, Nr and rin, this fraction contained a higher concentration of free ABA than the pericarp tissue. In fully grown fruits, the level of ABA in the seeds and associated tissue was much less than in this fraction of younger fruits and less than half that in the pericarp tissue. Free ABA in seeds and associated tissues remained low in nor fruits of both ages. The ratios of bound and free ABA in seeds and associated tissues in all strains were generally similar to those found in pericarp tissue. In Rutgers fruits, free ABA increased after harvest. It is suggested that ABA is produced in both pericarp and seeds plus associated mucilaginous tissue. Accumulation of ABA does not seem to be a result of increased ethylene production but conversely may be involved in the increased ethylene evolution which accompanies ripening in normal strains. Since the pattern of changes in ABA and the accumulation of peak concentrations in pericarp tissue was not consistently related to growth but was closely related to the onset of symptoms of ripening or senescence, ABA may be a regulator of ripening in the tomato.

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